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https://www.readbyqxmd.com/read/28551545/cytotoxicity-of-temozolomide-on-human-glioblastoma-cells-is-enhanced-by-the-concomitant-exposure-to-an-extremely-low-frequency-electromagnetic-field-100hz-100g
#1
Zeinab Akbarnejad, Hossein Eskandary, Luciana Dini, Cristian Vergallo, Seyed Noureddin Nematollahi-Mahani, Alireza Farsinejad, Maryam Fekri Soofi Abadi, Meysam Ahmadi
Glioblastoma multiforme (GBM) is the most malignant brain cancer that causes high mortality in humans. It responds poorly to the most common cancer treatments, such as surgery, chemo- and radiation therapy. Temozolomide (TMZ) is an alkylating agent that has been widely used to treat GBM; resistance to this drug is often found. One unexplored possibility for overcoming this resistance is a treatment based on concomitant exposure to electromagnetic fields (EMF) and TMZ. Indeed, many evidences show that EMF affects cancer cells and drug performance...
May 24, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28551209/electromagnetic-induction-of-foam-based-nanoscale-zerovalent-iron-nzvi-particles-to-thermally-enhance-non-aqueous-phase-liquid-napl-volatilization-in-unsaturated-porous-media-proof-of-concept
#2
Supawan Srirattana, Kitsanateen Piaowan, Gregory V Lowry, Tanapon Phenrat
Nanoscale zerovalent iron (NZVI) is a promising remediation agent for volatile organic compound (VOC) contamination in saturated sub-surfaces, but is rarely applied to the vadose zone as there are not enough water molecules in the unsaturated zone to participate in reductive dechlorination. In this study, we evaluated the possibility of using foam as a carrying vehicle to emplace NZVI in unsaturated porous media followed by the application of low frequency-electromagnetic field (LF-EMF) to enhance VOC volatilization in laboratory batch reactors...
May 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28550499/systematic-review-of-fmri-compatible-devices-design-and-testing-criteria
#3
REVIEW
V Hartwig, N Carbonaro, A Tognetti, N Vanello
Functional Magnetic Resonance Imaging (fMRI) is at present one of the most used methodologies for functional brain exploration, both in clinical and research settings. fMRI can noninvasively measure neural activity by using specific experimental paradigms. Often, these paradigms require the stimulation of the subject to perform sensorimotor tasks: in the past, the stimuli have been administered manually for investigating fundamental aspects of tactile perception and somatosensory processing. Nowadays, the use of mechatronic devices to stimulate the subject during fMRI studies is growing, also to assure reproducibility, control, and monitoring of task performances...
May 26, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28548516/relativistic-electron-streaming-instabilities-modulate-proton-beams-accelerated-in-laser-plasma-interactions
#4
S Göde, C Rödel, K Zeil, R Mishra, M Gauthier, F-E Brack, T Kluge, M J MacDonald, J Metzkes, L Obst, M Rehwald, C Ruyer, H-P Schlenvoigt, W Schumaker, P Sommer, T E Cowan, U Schramm, S Glenzer, F Fiuza
We report experimental evidence that multi-MeV protons accelerated in relativistic laser-plasma interactions are modulated by strong filamentary electromagnetic fields. Modulations are observed when a preplasma is developed on the rear side of a μm-scale solid-density hydrogen target. Under such conditions, electromagnetic fields are amplified by the relativistic electron Weibel instability and are maximized at the critical density region of the target. The analysis of the spatial profile of the protons indicates the generation of B>10  MG and E>0...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28545233/hydrothermal-synthesis-of-nanooctahedra-mnfe%C3%A2-o%C3%A2-onto-the-wood-surface-with-soft-magnetism-fire-resistance-and-electromagnetic-wave-absorption
#5
Hanwei Wang, Qiufang Yao, Chao Wang, Zhongqing Ma, Qingfeng Sun, Bitao Fan, Chunde Jin, Yipeng Chen
In this study, nanooctahedra MnFe₂O₄ were successfully deposited on a wood surface via a low hydrothermal treatment by hydrogen bonding interactions. As-prepared MnFe₂O₄/wood composite (MW) had superior performance of soft magnetism, fire resistance and electromagnetic wave absorption. Among them, small hysteresis loops and low coercivity (<±5 Oe) were observed in the magnetization-field curve of MW with saturation magnetization of 28.24 emu/g, indicating its excellent soft magnetism. The MW also exhibited a good fire-resistant property due to its initial burning time at 20 s; while only 6 s for the untreated wood (UW) in combustion experiments...
May 23, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28543948/the-physics-of-mri-safety
#6
REVIEW
Lawrence P Panych, Bruno Madore
The main risks associated with magnetic resonance imaging (MRI) have been extensively reported and studied; for example, everyday objects may turn into projectiles, energy deposition can cause burns, varying fields can induce nerve stimulation, and loud noises can lead to auditory loss. The present review article is geared toward providing intuition about the physical mechanisms that give rise to these risks. On the one hand, excellent literature already exists on the practical aspect of risk management, with clinical workflow and recommendations...
May 19, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28543615/improved-image-quality-and-reduced-power-deposition-in-the-spine-at-3-t-using-extremely-high-permittivity-materials
#7
Kirsten Koolstra, Peter Börnert, Wyger Brink, Andrew Webb
PURPOSE: To explore the effect of using extremely high permittivity (εr ∼1,000) materials on image quality and power requirements of spine imaging at 3 T. THEORY AND METHODS: A linear array of high permittivity dielectric blocks made of lead zirconate titanate (PZT) was designed and characterized by electromagnetic simulations and experiments. Their effect on the transmit efficiency, receive sensitivity, power deposition, and diagnostic image quality was analyzed in vivo in 10 healthy volunteers...
May 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28543540/computational-modeling-of-915-mhz-microwave-ablation-comparative-assessment-of-temperature-dependent-tissue-dielectric-models
#8
Garron Deshazer, Mark Hagmann, Derek Merck, Jan Sebek, Kent B Moore, Punit Prakash
PURPOSE: The objective of this study is to develop a computational model for simulating 915 MHz microwave ablation (MWA), and verify the simulation predictions of transient temperature profiles against experimental measurements. Due to the limited experimental data characterizing temperature-dependent changes of tissue dielectric properties at 915 MHz, we comparatively assess two temperature dependent approaches of modeling of dielectric properties: model A- piecewise linear temperature dependencies based on existing, but limited, experimental data, and model B- similar to model A, but augmented with linear decrease in electrical conductivity above 95 °C, as guided by our experimental measurements...
May 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28543091/intraoperative-localized-constrained-registration-in-navigated-bronchoscopy
#9
Erlend Fagertun Hofstad, Hanne Sorger, Janne Beate Lervik Bakeng, Lucian Gruionu, Håkon Olav Leira, Tore Amundsen, Thomas Langø
PURPOSE: One of the major challenges in electromagnetic navigated bronchoscopy is the navigation accuracy. An initial rigid image-to-patient registration may not be optimal for the entire lung volume, as the lung tissue anatomy is likely to have shifted since the time of computer tomography (CT) acquisition. The accuracy of the initial rigid registration will also be affected throughout the procedure by breathing, coughing, patient movement and tissue displacements due to pressure from bronchoscopy tools...
May 25, 2017: Medical Physics
https://www.readbyqxmd.com/read/28542716/improving-needle-tip-identification-during-ultrasound-guided-procedures-in-anaesthetic-practice
#10
REVIEW
H J Scholten, A Pourtaherian, N Mihajlovic, H H M Korsten, R A Bouwman
Ultrasound guidance is becoming standard practice for needle-based interventions in anaesthetic practice, such as vascular access and peripheral nerve blocks. However, difficulties in aligning the needle and the transducer can lead to incorrect identification of the needle tip, possibly damaging structures not visible on the ultrasound screen. Additional techniques specifically developed to aid alignment of needle and probe or identification of the needle tip are now available. In this scoping review, advantages and limitations of the following categories of those solutions are presented: needle guides; alterations to needle or needle tip; three- and four-dimensional ultrasound; magnetism, electromagnetic or GPS systems; optical tracking; augmented (virtual) reality; robotic assistance; and automated (computerised) needle detection...
May 22, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28542011/the-weighted-peak-method-in-the-time-domain-compared-with-alternative-methods-for-assessing-lf-electric-and-magnetic-fields
#11
Helmut Keller
Directive 2013/35/EU of the European Parliament and Council recommends the weighted peak method for assessing non-thermal effects of low frequency (LF) electric and magnetic fields. This article shows that this method is very practical and user friendly and is absolutely reliable to lead to correct results when applied in the time domain. The method can be used without limitations for any field profile and emulates the underlying physical and biological effects significantly better than all other presently known methods...
July 2017: Health Physics
https://www.readbyqxmd.com/read/28541797/the-effect-of-intraoperative-graft-coverage-with-preserved-remnant-tissue-on-the-results-of-the-pivot-shift-test-after-anatomic-double-bundle-anterior-cruciate-ligament-reconstruction-quantitative-evaluations-with-an-electromagnetic-sensor-system
#12
Nobuto Kitamura, Kazunori Yasuda, Masashi Yokota, Keiko Goto, Susumu Wada, Jun Onodera, Eiji Kondo
BACKGROUND: Remnant tissue preservation may be important in improving graft healing after anterior cruciate ligament (ACL) reconstruction, but it has yet to be established whether remnant tissue preservation improves the control of pivot-shift laxity. HYPOTHESIS: The amount of ACL graft coverage with preserved remnant tissue improves the control of pivot-shift laxity, as qualitatively determined with an electromagnetic device. STUDY DESIGN: Cohort study; Level of evidence, 3...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28539627/assembly-of-gold-nanoparticles-into-aluminum-nanobowl-array
#13
Xingce Fan, Qi Hao, Renchao Jin, Hao Huang, Zhengwei Luo, Xiaozhi Yang, Yile Chen, Xingzhi Han, Meng Sun, Qihua Jing, Zhenggao Dong, Teng Qiu
We mimic unique honeycomb structure as well as its functions of storing honey and pollen to assemble Au nanoparticle pattern on honeycomb-like Al nanobowl array by utilizing solid state dewetting process. Patterned Au nanoarrays of 'one particle per bowl' with tunable plasmonic bands ranging from the visible to the near-infrared region are fabricated by finely selecting the initial thickness of Au film, the geometry of Al nanobowl array and the thermal treatment parameters. This work presents a powerful approach to assemble Au nanoparticles into high density nanoarrays with superior spatial resolution, offering highly concentrated electromagnetic fields for plasmonic sensor applications...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539622/high-visibility-first-order-subwavelength-interference-based-on-light-pulse-storage-via-electromagnetically-induced-transparency
#14
Zhixiang Li, Jianji Liu, Hongming Fan, Jiachen Liu, Guoquan Zhang
We achieved high visibility first-order subwavelength interference based on light pulse storage and retrieval technique via electromagnetically induced transparency (EIT) effect in a Pr(3+):Y2SiO5 crystal. The interference field distribution of a double-slit was first stored in a Pr(3+):Y2SiO5 crystal based on EIT effect, and then it was read out by a spatially modulated readout beam. The retrieved output field is proportional to the product of the input interference field of the double-slit and the spatially modulated readout field...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539600/superb-electromagnetic-wave-absorbing-composites-based-on-large-scale-graphene-and-carbon-nanotube-films
#15
Jinsong Li, Weibang Lu, Jonghwan Suhr, Hang Chen, John Q Xiao, Tsu-Wei Chou
Graphene has sparked extensive research interest for its excellent physical properties and its unique potential for application in absorption of electromagnetic waves. However, the processing of stable large-scale graphene and magnetic particles on a micrometer-thick conductive support is a formidable challenge for achieving high reflection loss and impedance matching between the absorber and free space. Herein, a novel and simple approach for the processing of a CNT film-Fe3O4-large scale graphene composite is studied...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539210/design-and-testing-of-a-controlled-electromagnetic-spinal-cord-impactor-for-use-in-large-animal-models-of-acute-traumatic-spinal-cord-injury
#16
Rory J Petteys, Steven M Spitz, Hasan Syed, R Andrew Rice, Rachel Sarabia-Estrada, C Rory Goodwin, Daniel M Sciubba, Brett A Freedman
BACKGROUND: Spinal cord injury (SCI) causes debilitating neurological dysfunction and has been observed in warfighters injured in IED blasts. Clinical benefit of SCI treatment remains elusive and better large animal models are needed to assess treatment options. Here, we describe a controlled electromagnetic spinal cord impactor for use in large animal models of SCI. METHODS: A custom spinal cord impactor and platform were fabricated for large animals (e.g., pig, sheep, dog, etc...
May 20, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28537898/resveratrol-may-reverse-the-effects-of-long-term-occupational-exposure-to-electromagnetic-fields-on-workers-of-a-power-plant
#17
Dan Zhang, Yang Zhang, Baoyu Zhu, He Zhang, Ye Sun, Chengxun Sun
High-voltage electricity lines are known to generate extremely low-frequency electromagnetic fields (ELF-EMFs). With the process of urbanization, increasing concerns has been focused on the potentially hazardous impacts of ELF-EMF on human health, and the conclusions are controversial. Little is known about the method of prevention against ELF-EMF induced healthy problems. A total of 186 male workers with occupational exposure to high-voltage electricity lines, and 154 male subjects with insignificant exposure as reference control were enrolled in this study...
May 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28537636/electromagnetic-field-coupling-characteristics-in-graphene-plasmonic-oligomers-from-isolated-to-collective-modes
#18
Junbo Ren, Weibin Qiu, Houbo Chen, Pingping Qiu, Zhili Lin, Jia-Xian Wang, Qiang Kan, Jiao-Qing Pan
In this paper, we propose a plasmonic tetramer composed of coupled graphene nanodisks. The transformation from the isolated to the collective modes of the proposed structure is investigated by analysing the whispering-gallery modes and extinction spectra with various inter-nanodisk gap distances. In addition, the effect of introducing a central nanodisk into the tetramer on the extinction spectra is explored, which leads to Fano resonance. Furthermore, the refractive index sensing properties of the proposed graphene plasmonic oligomer have been demonstrated...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537611/metal-nanoinks-as-chemically-stable-surface-enhanced-scattering-sers-probes-for-the-analysis-of-blue-bic-ballpoint-pens
#19
A Alyami, D Saviello, M A P McAuliffe, A Mirabile, L Lewis, D Iacopino
Metal nanoinks constituted by Ag nanoparticles and Au nanorods were employed as probes for the Surface Enhanced Raman Scattering (SERS) analysis of a blue BIC ballpoint pen. The dye components of the pen ink were first separated by thin layer chromatography (TLC) and subsequently analysed by SERS at illumination wavelengths of 514 nm and 785 nm. Compared to normal Raman conditions, enhanced spectra were obtained for all separated spots, allowing easy identification of phthalocyanine Blue 38 and triarylene crystal violet in the ink mixture...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537455/efficacy-of-dipeptide-coated-magnetic-nanoparticles-in-lung-cancer-models-under-pulsed-electromagnetic-field
#20
Ganga Baskar, Mathangi Ravi, Jiban Jyoti Panda, Anjali Khatri, Bhawna Dev, Roy Santosham, Sekar Sathiya, Chidambaram Saravana Babu, Virander Singh Chauhan, Suresh K Rayala, Ganesh Venkatraman
Lung cancer is the leading cause of cancer deaths and the overall 5-year survival rate is less than 17%. Hyperthermia is an alternative approach for the treatment of lung cancer and is associated with fewer side effects. We employed ironoxide nanoparticles in inducing localized hyperthermia in lung cancer cells using a pulsed electromagnetic field (PEMF). We synthesized, characterized and determined the uptake of dipeptide-coated iron oxide nanoparticles. Further, their ability in inducing localized hyperthermia in PEMF on lung cancer cells was assessed...
May 24, 2017: Cancer Investigation
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